Clojure startup time is slow. AOT helps a little. http://clojure.org/compilation http://clojure.org/compilation Clojure runs quite fast, in my experience. I ha

Clojure startup time is slow. AOT helps a little. http://clojure.org/compilation http://clojure.org/compilation Clojure runs quite fast, in my experience. I have written an web app http://rssminer.net http://rssminer.net, in Clojure (and some Java). On a small VPS(512M RAM, 1 core CPU), It can handle about 300 request per second, On my desktop, about 2000 req/s. Which is not slow, at least. The persistent data structures Clojure use is fast too. I did some test a long ago, It's roughly the same speed as Java collections.